耳屎对保护人类的耳朵有很重要的作用，而有时人们需要清理一下它
Some people's ears produce wax like busy little bees. This can be a problem even though earwax appears to serve an important purpose. Experts say it protects and cleans the ear. It traps dirt and other matter and keep insects out. Doctors think it might also help protect against infections. And the …